Add Xphere Mainnet (ethereum-lists#6983)

* fix: Add Xphere Mainnet

* chore: Update Xphere Mainnet chain details

* chore: Remove Tamsa explorer from Xphere Mainnet

Author: Kim-DaeHan

_data/chains/eip155-20250217.json

@@ -0,0 +1,18 @@
+{
+  "name": "Xphere Mainnet",
+  "chain": "Xphere",
+  "icon": "xphere",
+  "features": [{ "name": "EIP155" }, { "name": "EIP1559" }],
+  "rpc": ["https://en-bkk.x-phere.com"],
+  "faucets": [],
+  "nativeCurrency": {
+    "name": "Xphere",
+    "symbol": "XP",
+    "decimals": 18
+  },
+  "infoURL": "https://x-phere.com/",
+  "shortName": "xp",
+  "chainId": 20250217,
+  "networkId": 20250217,
+  "explorers": []
+}